Screw-making machine.



G. KUHN.

SCREW MAKING- MACHINE.

nrmoumn FILED MAB. 7. 1912.

Patented Feb. 4, 1913.

2 SHEETSSHEET 1.

- G. KUHN.

SGREW MAKING MACHINE.

APPLICATION FILED MAR. 7 1912. 1,052,0 Patented Feb. 4, 1913.

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Specification ofLetters Patent. Patented Feb,v4, 1 913.

' n pplicationfiled Iarch' 7, 1912.. Serial No.-682,143:-

To all whom it may concern:

Be it known that I, Gorrrnmn KUHN, a citizen of the Confederation ofSwitzerland, and a resident of New York city, borough of Manhattan,county and State of New York,

have invented certain new and useful Improvements in Screw-MakingMachines, of

4 which the following is a specification.

This invention relates to improvements in screw-making machines and hasfor its object to provide a machine by means of which the screw-threadsmay be given a correct pitch.

Hitherto it has been found that in providing the screws with theirthreads or providing the sockets (nuts) with screwsthreads, thesescrew-threads would, when the metal was hardened; the screws to beshrunk so as tdjtake threads out of their true normal. When this resultsthe screw-threads of the part which has been heated and shrunk, will notmesh with the threads on the other part with which they are intended tomesh, (which part has not been heated) and for this reason, it .wasnecessary to finish up the screw-threads by extra mechanism.

A specific object of the invention is to so make the screw-threads thaton the hardena ing of the same they will correspond to the so true ornormal pitch and hence the companion screw-threads will truly engagetherewith.

For this purpose my invention consists of means for moving'the slidecarrying the cutting-tool atits normal rate of speed, and meansconnected therewith and cooperating therewith for giving the lead-screwand slide an additional movement so as to cause the screw-threads to beshaped out of their normal, so that on hardening they will be in normalposition.

In the accompanying drawings, Flgure 1 Referring to the drawings,Figural shows a side-view of a lathe which is provided with theoperating p'ulley 10 over which the usual belt passes, and with theother parts .usually found on special tools. The lathe is provided atone side with a transmission gearing 15 which transmits motion from thelathe spindle 11 to'the leadescrew which is providedwith a thread 21engaging a corresponding. thread in the slide 22. By the rotation of thelead-screw by 'means of the transmission gearing 15, the slide'is movedat its normal rate of speed in one direction of its movement All this iswell known.

In Fig. '2 the improvements are shown which means convert the rotarymovement of the lead-screw into a rectilinear movement. For this purposethe lead-screw 20 is provided with a beveled gear 25 meshing with abeveled gear 26 secured'on a shaft 27 to the other end of which a .worm28 is secured. The lead-screw 20 is connected with the bevel gear 26 bya key 20' or otherwise in such a manner that both will be compelledmeshing with a second gear Wheel 32. A

shaft 33 supports the gear wheel 32-and on the shaft 33 is fixed apinion34 which engages wlth a gear'35'on a 'shaft 3,6. The

shaft 36 has secured thereto a second gear wheel 39 which meshes with agear 40 connected by means of the key 41 to the rotatable sleeve 42which is provided with screwthreads 43 engaging correspondingscrewthreads in the fixed member 45 forming part of the frame of themachine. The threaded portion 43 of the sleeve' 42. has an extendedportion 47 at one end and at the other end an extended portion 48engaging a collar 49 secured to the lead-screw 20. Theseextendingportions 47 and 48 limit the movement of the sleeve in eitherdirection. The gear wheel 40 is movable laterally relatively to the gearwheel 39 and'by the rotation of the various transmission gears, the gearwheel 40 is rotated so as to cause the screw-threads 43 meshing in' thefixed part. 45 to move therein and cause the gear 40 'to move laterallyrelatively to the gear 39. This lateral movement in either directiongives the leadscrew 20 a lengthwise movement in the corresponding.direction and the speed of transmission of the various gearing and thepitch the lead-screw so t at thereby a difl'erential action takes placewhich gives the tlireads an Correction in Letters Patent Nc. 1,052,066.

additional pitch.

The apparatusshown may be applied to any lathe.

By means of this difie'rential action the screw-threads of the workwhich is being operated upon are shifted out of thenormal pitch to suchan extent that on the heating of the same and consequent cooling thepitchv that will result thereby will be entirely normal and thereby becapable of being meshed with any other normal pitch, corresponding tothe feed obtained by the screw art 21 of the lead-screw alone, withoutany ongitudinal movement of the lead-screw.

Having thus described. my invention, I claim as new and desire to secureby Letters Patent: 1

1. In a lathe for cutting screw-threads, a slideadapted to carry thetool, a rotatable lead-screw'for said slide, a sleeve mounted toturn onsaid lead-screw but held to move lengthwise therewith, said'sleevehaving a I part, ad'ri screw-threaded connection with a stationary mentin ---Screw-Making Machines,

lsE -l f It is hereh v certified in'Letters Patent No. 1,052,0fi6, 1913,upon the application of Gottfried Kuhn,

read 25, and that the proper corrections Signed and sealed this 1st dayof April,

wheel held to turn with the ad-screw, an powertransmitting nism forrotating said wheel and t e sleeve at thejsame'time, and located betweensaid wheel and sleeve.

2. In a lathe for cutting screw-threads, a slide adapted to carry thetool, a rotatable lead-screw for said slide, a sleeve mounted to turn onsaid lead-screw but held to move lengthwise therewith, said sleevehaving a screw-threaded connection with a stationary part, adriving-wheel held to turn with the lead-screw but held against axialmovement,

said lead-screw being arranged to slide lengthwise in saiddriving-wheel, and mechanlsm for rotating said wheel and the sleeve atthe same time.

In testimony, that I claim the foregomg as my invention, I have signedmy name in presence of two subscribin wltnesses.

GOTTF IED KUHN.- Witnesses:

JOHN Mormon, L. M. DORMAN.

granted February 4,

of New York, N, for an improvean errorappears in the printedspecification requiring correctionfas follows:' Page 1, lines 7 3 and76, for the reference-numeral have been made in the files and i recordsof the Patent Ofiice and are hereby made in said Letters Patent;

I 0. e amines, v Awa co missioner o p re za' mechaaction takes placewhich gives the tlireads an Correction in Letters Patent Nc. 1,052,066.

additional pitch.

The apparatusshown may be applied to any lathe.

By means of this difie'rential action the screw-threads of the workwhich is being operated upon are shifted out of thenormal pitch to suchan extent that on the heating of the same and consequent cooling thepitchv that will result thereby will be entirely normal and thereby becapable of being meshed with any other normal pitch, corresponding tothe feed obtained by the screw art 21 of the lead-screw alone, withoutany ongitudinal movement of the lead-screw.

Having thus described. my invention, I claim as new and desire to secureby Letters Patent: 1

1. In a lathe for cutting screw-threads, a slideadapted to carry thetool, a rotatable lead-screw'for said slide, a sleeve mounted toturn onsaid lead-screw but held to move lengthwise therewith, said'sleevehaving a I part, ad'ri screw-threaded connection with a stationary mentin ---Screw-Making Machines,

lsE -l f It is hereh v certified in'Letters Patent No. 1,052,0fi6, 1913,upon the application of Gottfried Kuhn,

read 25, and that the proper corrections Signed and sealed this 1st dayof April,

wheel held to turn with the ad-screw, an powertransmitting nism forrotating said wheel and t e sleeve at thejsame'time, and located betweensaid wheel and sleeve.

2. In a lathe for cutting screw-threads, a slide adapted to carry thetool, a rotatable lead-screw for said slide, a sleeve mounted to turn onsaid lead-screw but held to move lengthwise therewith, said sleevehaving a screw-threaded connection with a stationary part, adriving-wheel held to turn with the lead-screw but held against axialmovement,

said lead-screw being arranged to slide lengthwise in saiddriving-wheel, and mechanlsm for rotating said wheel and the sleeve atthe same time.

In testimony, that I claim the foregomg as my invention, I have signedmy name in presence of two subscribin wltnesses.

GOTTF IED KUHN.- Witnesses:

JOHN Mormon, L. M. DORMAN.

granted February 4,

of New York, N, for an improvean errorappears in the printedspecification requiring correctionfas follows:' Page 1, lines 7 3 and76, for the reference-numeral have been made in the files and i recordsof the Patent Ofiice and are hereby made in said Letters Patent;

I 0. e amines, v Awa co missioner o p re za' mecha-

